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21. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:35:07 +0000; Depends what you want the zeners to achieve - spike protection or something longer-term. That implies you were drawing less than 10mA total, to supply the screens for two tubes *and* bleed a keep-ali; /archives//html/Amps/2002-01/msg00232.html (12,610 bytes)
22. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:58:55 +0000; Thanks, Marv - I'm pleased to learn it can be done reliably. Is this with an active regulator or with zeners? -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RS; /archives//html/Amps/2002-01/msg00233.html (10,501 bytes)
23. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 07:41:29 +0000; You forgot to add the engineering know-how to make it work... and that's priceless. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com; /archives//html/Amps/2002-01/msg00248.html (9,855 bytes)
24. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 08:05:45 +0000; I usually trim my quotes, but couldn't leave out any part of that good stuff. It shows that an idea that I'd though un-promising can be made to work well and reliably, but that's because Marv has the; /archives//html/Amps/2002-01/msg00249.html (13,615 bytes)
25. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:36:36 +0000; I should have said "won't cut it on their own" - and that rather proves the point. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/; /archives//html/Amps/2002-01/msg00260.html (10,648 bytes)
26. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:56:04 +0000; I am the only person in the world who sells such boards. If you have a specific accusation, then put up or back down. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for Ra; /archives//html/Amps/2002-01/msg00261.html (9,721 bytes)
27. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:51:34 +0000; There doesn't seem to be any real need for an active series element to feed an active MOSFET shunt regulator. The loop gain in the shunt part is already very high, so the series feed can be just a pl; /archives//html/Amps/2002-01/msg00262.html (11,451 bytes)
28. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:35:12 +0000; Not unless you have some very special iron. The anode-cathode voltage comes from two separate stacked power supplies, connected at the screen (chassis). Therefore the "anode" and "screen" supplies ea; /archives//html/Amps/2002-01/msg00263.html (10,880 bytes)
29. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 21:18:50 +0000; Good grief, Tom! I certainly *hope* there is a difference. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: htt; /archives//html/Amps/2002-01/msg00276.html (10,237 bytes)
30. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 21:29:20 +0000; My remark about "cheap zeners" came from an earlier statement by Rich: It had nothing to do with the alleged quality of the semiconductors. Put it down to the "common language" barrier. If the well-k; /archives//html/Amps/2002-01/msg00277.html (12,721 bytes)
31. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 23:27:20 +0000; A small change in V for a given change in I is characteristic of *low* resistance, not high. Check the device data sheets for the definition of dynamic resistance, or almost any electronics textbook.; /archives//html/Amps/2002-01/msg00289.html (9,981 bytes)
32. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 30 Jan 2002 08:00:35 +0000; I'm not your personal Remedial Electronics coach. Go look it up. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WW; /archives//html/Amps/2002-01/msg00305.html (9,579 bytes)
33. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 30 Jan 2002 23:04:43 +0000; I apologise to the group for my contribution to this "catcalling". However severe the provocation, I should not have risen to it. For my point of view, please see: http://www.ifwtech.com/g3sek/boards; /archives//html/Amps/2002-01/msg00345.html (10,204 bytes)
34. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 31 Jan 2002 14:33:35 +0000; I don't quote the figures because they're almost embarrassingly good. The output regulation, hum and noise are all typically below 100mV - a 4-1/2 digit DVM doesn't flicker between no load and full l; /archives//html/Amps/2002-01/msg00375.html (9,129 bytes)
35. [AMPS] Another Stupid Question (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 3 Dec 2001 09:11:25 +0000; Shouldn't that read: "the effect is to raise the load impedance presented to the tube"? As I'd understood it, the function of the pi-network is not to match the notional plate impedance of the tube,; /archives//html/Amps/2001-12/msg00015.html (9,527 bytes)
36. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 08:22:14 +0000; This is only relevant when the two capacitors are very *different*. You then get a parallel resonance, between the lower capacitance and the self-inductance of the higher-value one. For example, if y; /archives//html/Amps/2001-12/msg00091.html (9,427 bytes)
37. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 12:41:02 +0000; We're still waiting for a specific reference to the circuit that has this design flaw. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.; /archives//html/Amps/2001-12/msg00096.html (9,131 bytes)
38. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 12:59:50 +0000; [...] Certainly it's real. When you connect the two capacitors together at each end, you make a series-resonant loop. Guessing at values, two 1000pF caps, in series with a total of 8nH lead inductanc; /archives//html/Amps/2001-12/msg00100.html (10,248 bytes)
39. [AMPS] AL1500 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 13:27:13 +0000; I know of no grid current monitoring circuits that behave as you describe - that's my point. This ball has been in your court for some months, Rich. If there are "several" such circuits, you'll have; /archives//html/Amps/2001-12/msg00110.html (9,238 bytes)
40. [AMPS] Re: 6m amp blocking caps (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 5 Dec 2001 16:05:01 +0000; I had written: Not unless the current capacity is more than two times greater than each of the two paralleled caps. Since I don't know exactly what you mean, I wouldn't care to comment. Not at all -; /archives//html/Amps/2001-12/msg00119.html (11,181 bytes)

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